package year2021.month0234;

import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

public class ConcurrentHashMapTest {

    public static void main(String[] args){
        Map map = new HashMap();
        Map tMap = new Hashtable();
        ConcurrentMap cMap = new ConcurrentHashMap();
    }

}
